Here's what rhymes with iontrol.
role roll droll troll prole control whole soul coal goal hole pole sole bowl fol mole poll toll parole stroll knoll shoal dole foal bole boll thole unroll vole kohl tole dolour patrol stole scroll enroll bedroll decontrol oriole maypole rissole skoal arteriole cajole petiole condole camisole innersole glycerol systole casserole extol vacuole cubbyhole extoll beanpole quadrupole buttonhole pigeonhole profiterole